Notes on the Dianous luteoguttatus complex with description of a new species (Coleoptera: Staphylinidae)

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MUSEI NATIONALIS PRAGAE

_www.aemnp.eu

ISSN 1804-6487 (online) – 0374-1036 (print)

S H O R T C O M M U N I C A T I O N

Notes on the

Dianous

luteoguttatus

complex

with description of a new species (Coleoptera: Staphylinidae)

Liang TANG & Wei WANG

Department of Biology, Shanghai Normal University, 100 Guilin Road, 1st_{Educational Building 323 Room, Shanghai, 200234 P. R. China;}

e-mail: staphylinidae@shnu.edu.cn

Abstract. Dianous lilizheni sp. nov., a new species of the Dianousluteoguttatus complex from China, is described. Males of D.vorticipennis Puthz, 2005 and D. depressifrons Puthz, 2016 and the female of D.rimosipennis Puthz, 2005 are discovered for the fi rst time. New distri-butional records are reported for D. cruentatus L. Benick, 1942 and D. depressifrons Puthz, 2016. A key to species of the Dianousluteoguttatus complex is provided.

Key words. Coleoptera, Staphylinidae, Dianousluteoguttatus complex, new species, iden-tifi cation key, China

ZooBank: http://zoobank.org/urn:lsid:zoobank.org:pub:E0D2154F-829D-4995-AAFF-5B01F282DBB0

6th_{June 2018}

Published online: 21th_{July 2018}

Introduction

The Dianous luteoguttatus complex established by PUTHZ (2005) is a small group with fi ve known species:

Dianous luteoguttatus Champion, 1919, D. cruentatus

L. Benick, 1942, D. rimosipennis Puthz, 2005, D. vor-ticipennis Puthz, 2005 and D. depressifrons Puthz, 2016 (PUTHZ 2016). The members of the complex can be easily

recognized by the following combination of characters: eyes large, 2.5–3.5 times as long as temple, interocular area deeply concave with median portions slightly convex, and hind tarsomeres IV simple with long setae or tarsal shoes. A detailed defi nition of the complex can be found in PUTHZ (2005, 2016).

In this paper, a sixth species of the Dianousluteoguttatus

complex is described, range extensions and characters for newly discovered sexes of several species are also reported.

Material and methods

The specimens examined in this paper were collected by searching exposed rocks and logs in streams, and killed with ethyl acetate. For examination of the genitalia, the last three abdominal segments were detached from the body after softening in hot water. The aedeagi or the valvifers,

together with other dissected pieces, were mounted in Eu-paral (Chroma Gesellschaft Schmidt, Koengen, Germany) on plastic slides. Photos of sexual characters were taken with a Canon G9 camera attached to an Olympus SZX 16 stereoscope; habitus photos were taken with a Canon ma-cro photo lens MP-E 65 mm attached to a Canon EOS7D camera and stacked with Zerene Stacker (http://www. zerenesystems.com/cms/stacker).

The specimens treated in this study are deposited in the following public and private collections:

SHNU Department of Biology, Shanghai Normal University,

P. R. China;

cPut private collection Volker Puthz, Schlitz, Germany; cSme private collection Aleš Smetana, Ottawa, Canada.

Body measurements are abbreviated as follows:

BL body length, measured from the anterior margin of the clypeus to the posterior margin of abdominal tergite X

FL forebody length, measured from the anterior margin of the clypeus to the apex of the elytra (apicolateral angle) HW width of head including eyes

PW width of pronotum at the widest point EW width of elytra at the widest point

PL length of pronotum

EL length of elytra, measured from humeral angle

SL length of elytral suture

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TANG & WANG: Notes on the Dianous luteoguttatus complex in China (Coleoptera: Staphylinidae)

238

Taxonomy

Dianous luteoguttatus Champion, 1919

(Fig. 1)

Dianous luteoguttatus Champion, 1919: 98; PUTHZ (2000: 451); PUTHZ

(2016: 749).

Material examined. CHINA: TAIWAN: 1 , Nantou Hsien, Shanlinchi, 1650 m, 19.v.1991, A. Smetana leg. (cSme)

Distribution. China (Taiwan), India, Nepal, Vietnam.

Dianous cruentatus L. Benick, 1942

(Figs 2, 7–9)

Dianous cruentatus L. Benick, 1942: 37, PUTHZ (2015: 150).

Material examined. CHINA: YUNNAN: 1 , Lushui County, Qiqi, alt. 1980 m, 25.v.2009, Jian-Qing Zhu leg. (SHNU); 1 , Lushui County, Pianma, alt. 2400 m, 24.vi.2010, Liang Tang leg. (SHNU); 6  2 , Gongshan County, Qiqi, alt. 1900 m, 2.vii.2010, Liang Tang leg. (SHNU); 4  6 , Tengchong County, Mingguang Town, Zizhi Vill., Donghe, 25°42′N 98°34′E, alt. 2100–2300 m, 1.v.2013, Dai, Peng & Song leg. (SHNU). XIZANG: 2 , Motuo County, Hanmi, alt. 2100 m, 23.vii.2011, Wen-Xuan Bi leg. (SHNU); 5  4 , Motuo County, Hanmi, alt. 2100 m, 12–31.vii.2013, Wen-Xuan Bi leg. (SHNU).

Measurements. BL: 6.1–7.2 mm, FL: 3.5–4.2 mm. HW: 1.24–1.49 mm, PL: 0.95–1.13 mm, PW: 0.83–0.95 mm, EL: 1.31–1.56 mm, EW: 1.19–1.44 mm, SL: 1.03–1.28 mm. Head 0.92–1.05 times as wide as elytra; pronotum 1.15–1.21 times as long as wide; elytra 1.07–1.13 times as long as wide.

Distribution. China (Yunnan, Xizang), Myanmar. Notes. The species can be easily recognized among the members of the complex by its bicolored femora. It can also be distinguished from other spotted species of the complex by the larger punctures of the head and smaller elytra spots. It can be distinguished from D. luteoguttatus

and D. rimosipennis by the deeply concave median portion of the interocular area and larger eyes. The species is new to Xizang.

Dianous rimosipennis Puthz, 2005

(Figs 3, 10)

Dianous rimosipennis Puthz, 2005: 141.

Material examined. CHINA: YUNNAN: 1 , Jinghong City, Nabanhe N. R., Naban Vill., 7.i.2004, Li & Tang leg. (SHNU).

Measurements. BL: 6.8 mm, FL: 3.4 mm. HW: 1.25 mm, PL: 1.03 mm, PW: 0.9 mm, EL: 1.54 mm, EW: 1.43 mm, SL: 1.25 mm. Head 0.88 times as wide as elytra; pronotum 1.14 times as long as wide; elytra 1.08 times as long as wide.

Description of female. Sternite VII with posterior margin slightly emarginate at middle; sternite VIII with posterior margin entire; valvifer (Fig. 10) with a slender apicolateral projection, posterior margin with four small teeth. Distribution. China (Yunnan).

Note. The above female specimen corresponds to the male holotype in all relevant characters and was found at a locality very close (420 km apart) to the type locality of the species. For these reasons we consider it as conspecifi c with the holotype of D. rimosipennis, despite not having examined any co-occurring male specimens.

Dianous depressifrons Puthz, 2016

(Figs 4, 11–14)

Dianous depressifrons Puthz, 2016: 731.

Material examined. CHINA: GUANGXI: 25  9 , Lingui County, Huaping N. R., Anjiangping, alt. 1200 m, 13–18.vii.2011, Peng & Zhu leg. (SHNU); 2  4 , Jinxiu County, Shengtangshan, alt. 1000–1200 m, 27.vii.2011, Peng Zhong leg. (SHNU); 4  3 , Jinxiu County, 16 km, alt. 900 m, 29.vii.2011, Peng Zhong leg. (SHNU); FUJIAN: 4 , Wuyishan City, Guadun Vill., 27°44′N 117°37′E, alt. 1200–1500 m, 24–28.v.2012, Peng & Dai leg. (SHNU).

Measurements. BL: 5.3–6.1 mm, FL: 2.9–3.1 mm. HW: 1.04–1.16 mm, PL: 0.84–0.95 mm, PW: 0.76–0.84 mm, EL: 1.24–1.41 mm, EW: 1.11–1.29 mm, SL: 1.05–1.15 mm. Head 0.90–0.94 times as wide as elytra; pronotum 1.03–1.15 times as long as wide; elytra 1.01–1.15 times as long as wide.

Description of male. Sternite V fl attened posteromedially; sternite VI impressed at posteromedian part, posterior mar-gin of the impression emarmar-ginate with a sharp projection on each side, pubescence of impression distinctly longer; sternite VII slightly impressed with shallow emargination along posterior margin of the impression, pubescence of impression distinctly longer; sternite VIII (Fig. 13) with deep emargination in the middle of posterior margin; ster-nite IX (Fig. 12) with apicolateral projections very strong and sharply pointed, posterior margin serrate; tergite X with posterior margin slightly emarginate. Aedeagus (Fig. 11) slender, apical sclerotized area nearly triangular with a short transverse ridge at middle; parameres slightly longer than median lobe, each with 24–28 setae on inner side of apical portion.

Distribution. China (Guangxi, Fujian), Vietnam. Remarks. The species is the smallest member of the com-plex with the elytra punctation less confl uent. The species is new to China.

Dianous vorticipennis Puthz, 2005

(Figs 5, 15–17)

Dianous vorticipennis Puthz, 2005: 144.

Material examined. CHINA: YUNNAN: 3 , Gongshan County, Qiqi, alt. 1900 m, 2.vii.2010, Liang Tang leg. (SHNU).

Measurements. BL: 7.5–7.9 mm, FL: 3.6–3.8 mm. HW: 1.43–1.44 mm, PL: 1.13–1.15 mm, PW: 0.98 mm, EL: 1.55–1.58 mm, EW: 1.28 mm, SL: 1.26–1.28 mm. Head 1.12–1.13 times as wide as elytra; pronotum 1.13–1.15 ti-mes as long as wide; elytra 1.22–1.24 titi-mes as long as wide. Description of male. Sternite VII fl attened posteromedial-ly with shallow emargination along posterior margin of the fl atten area; sternite VIII (Fig. 17) with emargination in the middle of posterior margin which is 0.13 times as long as the sternite; sternite IX (Fig. 16) with apicolateral projections slender and long, situated sublaterally rather than laterally, hind margin between projections serrate; tergite X with posterior margin broadly rounded. Aedea-gus (Fig. 15) nearly same to that of D. lilizheni sp. nov. except apical sclerotized area broader, parameres slightly longer than median lobe with 14–15 setae on inner side of apical portion.

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Figs 1–6. Habitus of the species of the Dianous luteoguttatus species complex. 1 – D.luteoguttatus Champion, 1919; 2 – D. cruentatus L. Benick, 1942; 3 – D. rimosipennis Puthz, 2005; 4 –D. depressifrons Puthz, 2016;5 –D. vorticipennis Puthz, 2005;6 – D. lilizheni sp. nov. Scale bars: 1 mm.

Remarks. The species can be easily distinguished from the other members of Dianous luteoguttatus complex by the characters mentioned by PUTHZ (2005) and the

key below. Additionally, the widest point of the elytra is distinctly anteriad of the basal half in this species, while always being posteriad of the basal half in the remaining species.

Dianous lilizheni sp. nov.

(Figs 6, 18–22)

Type material. HOLOTYPE. CHINA: SICHUAN:, glued on a card

with labels as follows: “China: Sichuan Prov., Emeishan, Qingyinge--Hongchunping, 7.VIII.2011, Huang Hao leg.” “Holotype / Dianous lilizheni/ Tang & Wang” [red handwritten label] (SHNU).PARATYPES.

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240

26.vii.2012, Peng, Dai & Yin leg. (cPut). YUNNAN: 1 , Jinghong City, Nabanhe N. R., Bengganghani, 14.i.2004, Li & Tang leg. (SHNU)

Description. Head and abdomen black, pronotum and elytra dark brown to blackish with strong plumbeous luster, antennae dark brown with club slightly lighter, legs blackish with tibiae and tarsomeres slightly lighter, trochanters brownish, maxillary palpi with segment I yellowish, segment II brown and segment III dark brown. Pubescence silvery, distinct on head and abdomen, nearly invisible on pronotum and elytra.

BL: 6.3–6.6 mm; FL: 3.1–3.4 mm. HW: 1.24–1.30 mm, PL: 0.95–0.99 mm, PW: 0.85–0.89 mm, EL: 1.33–1.43 mm, EW: 1.15–1.29 mm, SL: 1.10–1.18 mm.

Head 0.98–1.08 times as wide as elytra; interocular area with deep longitudinal furrows, median portion as wide as the side portions and convex posteriorly, extending far beneath the level of inner eye margins; punctures round to oval, those of anterior potion more or less confl uent, those of the remaining area well delimited, diameter of punctures slightly wider than medial ommatidia of eyes; interstices shallowly reticulated except those on median portion, which are smooth, interstices at frons and along the furrows narrower than half the diameter of punctures, those on the remaining portions as wide to moderately wider than diameter of punctures. Antennae very long, when refl exed, reaching basal half of the elytra.

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Pronotum 1.09–1.12 times as long as wide; disk uneven with transverse impression near anterior margin, two deep pits at about middle, short longitudinal furrow along the middle, two distinct impressions near posterolateral margin and transverse impression near posterior margin; punctures slightly larger than those of head, partially well delimited, those at anterior and posterior impressions strongly and transversely confl uent; interstices smooth, rugae-like and somewhat vorticose, mostly narrower than half the dia-meter of punctures except few on median portion or near anterior and posterior margins, which may be as wide as two or three punctures.

Elytra 1.09–1.15 times as long as wide; humeral impres-sions distinct; punctation strongly confl uent, interstices

smooth and rugae-like, those of posteromedian area strong-ly vorticose forming a complete rosetta.

Metasternum with median area impressed, sparsely punc tate and with dense microsculpture, diameter of punctures slightly wider than medial ommatidia of eyes.

Legs slender, metatarsi longer than 5/6 of hind tibiae, metatarsomere I distinctly longer than the following three segments combined, metatarsomere IV simple with long apical setae except for one paratype from Sichuan with metatarsomere IV slightly emarginate at apex.

Abdomen semi-cylindrical with broad, horizontal and densely punctate paratergites, width of paratergites of seg-ment IV as wide as median cross section of metatibia; poste-rior margin of tergite VII with palisade fringe; punctures on

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242

abdominal tergites III–VII minute, smaller than ommatidia of eyes, those on tergite VIII larger, as large as ommatidia of eyes; interstices transversely reticulated, varying from a little narrower than half the diameter of punctures to a little broader than diameter of punctures.

Male. Sternite VII slightly impressed posteromedially with shallow emargination along posterior margin of the impression, pubescence of impression distinctly longer; sternite VIII (Fig. 19) with deep emargination in the middle of posterior margin which is 0.23 times as long as the ster-nite; sternite IX (Fig. 22) with apicolateral projections very long, situated sublaterally rather than laterally; tergite X (Fig. 18) with posterior margin broadly rounded. Aedeagus (Figs 20, 21) slender, median lobe roundly prominent at apex with two sharp longitudinal ridges (dotted line in Fig. 21) on dorsal side, internal sac with slender copulatory tube and small basal tube; parameres slightly bent inwards and ventrally, as long as median lobe, each with 15–17 setae on inner side of apical portion.

Female. Unknown.

Etymology. This species is named in honor of Dr. Li-Zhen Li, my dear mentor.

Distribution. China (Sichuan, Yunnan).

Remarks. The species is closely related to Dianous vortici-pennis Puthz, 2005 from Yunnan, but can be distinguished from the latter by the sparser punctation of the interocular area and shorter elytra.

Key to the Dianous luteoguttatus complex

1 Elytra without orange spots, metatarsomere I distinctly longer than the following three tarsomeres combined . ... 2 – Elytra with orange spots, metatarsomere I distinctly

shorter than the following three tarsomeres combined. ... 3 2 Punctation of interocular area dense, elytra longer with

EL/EW=1.22–1.24. BL: 7.5–7.9 mm. Habitus: Fig. 5; sexual characters: Figs 15–17. China (Yunnan). ... ... D. vorticipennisPuthz, 2005 – Punctation of interocular area sparse, elytra shorter

with EL/EW=1.09–1.15. BL: 6.3–6.6 mm. Habitus: Fig. 6; sexual characters: Figs 18–22. China (Sichuan, Yunnan). ... D. lilizheni sp. nov. 3 Femora bicolored. BL: 6.1–7.2 mm. Habitus: Fig. 2;

sexual characters: Figs 7–9. China (Yunnan, Xizang), Myanmar. ... D. cruentatus L. Benick, 1942 – Femora uniformly black. ... 4

4 Smaller species with BL: 5.3–6.1 mm, median portion of interocular area with interstices about as wide as diameter of punctures, punctation of elytra less confl uent. Habitus: Fig. 4; sexual characters: Figs 11–14. China (Guangxi, Fujian), Vietnam. ... ... D. depressifrons Puthz, 2016 – Larger species with BL: 6.0–7.2 mm, median portion

of interocular area with interstices distinctly narrower than half the diameter of punctures, punctation of elytra more confl uent. ... 5 5 Body with plumbeous luster, pronotal punctation less

confl uent, elytral spots smaller. BL: 6.0–7.2 mm. Habitus: Fig. 1; sexual characters: Figs. 87, 90 in PUTHZ (2000), Fig. 1 in PUTHZ (1980). China (Taiwan),

India, Nepal, Vietnam. ... ... D. luteoguttatus Champion, 1919 – Body without plumbeous luster, pronotal punctation

more confl uent, elytral spots larger. BL: 6.0–7.0 mm. Habitus: Fig. 3; sexual characters: Fig. 10; see also Figs. 3, 6 in PUTHZ (2005).China (Yunnan). ...

... D. rimosipennis Puthz, 2005

Acknowledgments

We express our sincere gratitude to Dr. Volker Puthz (Germany) for his constant guidance on our study of Chi-nese Steninae, and to all the collectors, especially to dear Dr. Zhong Peng (SHNU) and Mr. Wen-Xuan Bi (Shanghai). This research was supported by the National Natural Sci-ence Foundation of China (No. 31672252).

References

BENICK L. 1942: Entomological results from the Swedish Expedition 1934 to Burma and British India, Coleoptera: Staphylinidae, gesmmelt von René Malaise. Arkiv för Zoologi (A)33(17): 1–48.

CHAMPION, G. C. 1919: Additional notes on the Indian species Dianous.

The Entomologist’s Monthly Magazine55: 97–101.

PUTHZ, V. 1980: Die gelblich gemakelten Dianous-Arten der Welt: Bes-timmungstabelle und Neubeschreibungen. Reichenbachia18: 1–11. PUTHZ, V. 2000: The genus Dianous Leach in China (Coleoptera, Sta-phylinidae). 261. Contribution to the knowledge of Steninae. Revue Suisse de Zoologie107(3): 419–559.

PUTHZ, V. 2005: Notes on Chinese Dianous Leach (Coleoptera: Sta-phylinidae). Entomological Review of Japan60: 137-152.